(Node.js) Bunny Sign URL and then Download using Signed URL

See more Bunny CDN Examples

Shows how to sign a URL for BunnyCDN Token Authentication and then use it to download.

For more information, see https://support.bunny.net/hc/en-us/articles/360016055099-How-to-sign-URLs-for-BunnyCDN-Token-Authentication

Install Chilkat for Node.js and Electron using npm at Chilkat npm packages for Node.js Chilkat npm packages for Electron on Windows, Linux, MacOSX, and ARM

var os = require('os');
if (os.platform() == 'win32') {  
    if (os.arch() == 'ia32') {
        var chilkat = require('@chilkat/ck-node21-win-ia32');
    } else {
        var chilkat = require('@chilkat/ck-node21-win64'); 
    }
} else if (os.platform() == 'linux') {
    if (os.arch() == 'arm') {
        var chilkat = require('@chilkat/ck-node21-arm');
    } else if (os.arch() == 'x86') {
        var chilkat = require('@chilkat/ck-node21-linux32');
    } else {
        var chilkat = require('@chilkat/ck-node21-linux64');
    }
} else if (os.platform() == 'darwin') {
    if (os.arch() == 'arm64') {
        var chilkat = require('@chilkat/ck-node21-mac-m1');
    } else {
        var chilkat = require('@chilkat/ck-node21-macosx');
    }
}

function chilkatExample() {

    // This example assumes the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    var success;
    var mySecurityKey = "e7ea8d73-8fa0-44ef-a2cc-91526f7df5ed";

    var url = "https://test.b-cdn.net/sample-pdf-with-images.pdf";

    // Extract the URL components.
    var urlObj = new chilkat.Url();
    urlObj.ParseUrl(url);

    var url_scheme = "https";
    if (urlObj.Ssl == false) {
        url_scheme = "http";
    }

    var url_host = urlObj.Host;
    var url_path = urlObj.Path;

    // Calculate an expiration time 1 hour from the current date/time.
    var expTime = new chilkat.CkDateTime();
    expTime.SetFromCurrentSystemTime();
    expTime.AddSeconds(3600);
    var expires = expTime.GetAsUnixTimeStr(false);

    console.log("Expires = " + expires);

    // Create the string to hash
    var sbToHash = new chilkat.StringBuilder();
    sbToHash.Append(mySecurityKey);
    sbToHash.Append(url_path);
    sbToHash.Append(expires);

    // Base64Url encoding is the same as base64, except "-" is used instead of "+",
    // "_" is used instead of "/", and no "=" padding is added.
    var token = sbToHash.GetHash("sha256","base64Url","utf-8");

    var sbSignedUrl = new chilkat.StringBuilder();
    sbSignedUrl.Append(url_scheme);
    sbSignedUrl.Append("://");
    sbSignedUrl.Append(url_host);
    sbSignedUrl.Append(url_path);
    sbSignedUrl.Append("?token=");
    sbSignedUrl.Append(token);
    sbSignedUrl.Append("&expires=");
    sbSignedUrl.Append(expires);

    var signedUrl = sbSignedUrl.GetAsString();
    console.log("Signed URL: " + signedUrl);

    // Use the signed URL to download the file.
    var http = new chilkat.Http();
    success = http.Download(signedUrl,"c:/aaworkarea/sample.pdf");
    if (success == false) {
        console.log(http.LastErrorText);
    }
    else {
        console.log("Success.");
    }


}

chilkatExample();